Решение:
$$\frac{13}{30} + \frac{1}{6} - \frac{7}{10} - \frac{11}{15} = \frac{13}{30} + \frac{1 \cdot 5}{6 \cdot 5} - \frac{7 \cdot 3}{10 \cdot 3} - \frac{11 \cdot 2}{15 \cdot 2} = \frac{13}{30} + \frac{5}{30} - \frac{21}{30} - \frac{22}{30} = \frac{13 + 5 - 21 - 22}{30} = \frac{-25}{30} = -\frac{5}{6}$$
Ответ: $$\frac{-5}{6}$$
Решение:
$$(-\frac{1}{2}) - \frac{47}{50} + (-\frac{2}{5}) + (-\frac{3}{10}) = -\frac{1 \cdot 25}{2 \cdot 25} - \frac{47}{50} - \frac{2 \cdot 10}{5 \cdot 10} - \frac{3 \cdot 5}{10 \cdot 5} = -\frac{25}{50} - \frac{47}{50} - \frac{20}{50} - \frac{15}{50} = \frac{-25 - 47 - 20 - 15}{50} = \frac{-107}{50} = -2\frac{7}{50}$$
Ответ: $$-2\frac{7}{50}$$
Решение:
$$\frac{23}{44} - \frac{1}{2} + \frac{3}{4} + \frac{31}{88} + \frac{9}{11} = \frac{23 \cdot 2}{44 \cdot 2} - \frac{1 \cdot 44}{2 \cdot 44} + \frac{3 \cdot 22}{4 \cdot 22} + \frac{31}{88} + \frac{9 \cdot 8}{11 \cdot 8} = \frac{46}{88} - \frac{44}{88} + \frac{66}{88} + \frac{31}{88} + \frac{72}{88} = \frac{46 - 44 + 66 + 31 + 72}{88} = \frac{171}{88} = 1\frac{83}{88}$$
Ответ: $$1\frac{83}{88}$$
Решение:
$$\frac{13}{46} - \frac{3}{4} - \frac{61}{120} + \frac{11}{30} - \frac{7}{12} = \frac{13 \cdot 120}{46 \cdot 120} - \frac{3 \cdot 46 \cdot 30}{4 \cdot 46 \cdot 30} - \frac{61 \cdot 46}{120 \cdot 46} + \frac{11 \cdot 4 \cdot 46}{30 \cdot 4 \cdot 46} - \frac{7 \cdot 10 \cdot 46}{12 \cdot 10 \cdot 46} = \frac{1560 - 4140 - 2806 + 2024 - 3220}{5520} = \frac{-6582}{5520} = \frac{-1097}{920}$$
Ответ: $$\frac{-1097}{920}$$